EntityQ5597087· pop 7· linked from 3 articlesgraph energySign in to savesum of the absolute values of the eigenvalues of the adjacency matrixConnectionsgraphEntitymathematicsEntityInternational Standard Book NumberEntityabsolute valueEntitygraph theoryEntityeigenvectors and eigenvaluesEntitynodeEntityadjacency matrixEntityMathematical ReviewsEntityspectral graph theoryEntityHorst SachsEntityCategoriesAlgebraic graph theory